Java Code Examples for android.support.v7.widget.RecyclerView

@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
    createPinnedHeader(parent);

    if (mPinnedHeaderView != null) {
        int headerEndAt = mPinnedHeaderView.getTop() + mPinnedHeaderView.getHeight();
        View v = parent.findChildViewUnder(c.getWidth() / 2, headerEndAt + 1);

        if (isPinnedView(parent, v)) {
            mPinnedHeaderTop = v.getTop() - mPinnedHeaderView.getHeight();
        } else {
            mPinnedHeaderTop = 0;
        }

        mClipBounds = c.getClipBounds();
        mClipBounds.top = mPinnedHeaderTop + mPinnedHeaderView.getHeight();
        c.clipRect(mClipBounds);
    }
}
 

private void addChildDrawingOrderCallback() {
    if (Build.VERSION.SDK_INT >= 21) {
        return;// we use elevation on Lollipop
    }
    if (mChildDrawingOrderCallback == null) {
        mChildDrawingOrderCallback = new RecyclerView.ChildDrawingOrderCallback() {
            @Override
            public int onGetChildDrawingOrder(int childCount, int i) {
                if (mOverdrawChild == null) {
                    return i;
                }
                int childPosition = mOverdrawChildPosition;
                if (childPosition == -1) {
                    childPosition = mRecyclerView.indexOfChild(mOverdrawChild);
                    mOverdrawChildPosition = childPosition;
                }
                if (i == childCount - 1) {
                    return childPosition;
                }
                return i < childPosition ? i : i + 1;
            }
        };
    }
    mRecyclerView.setChildDrawingOrderCallback(mChildDrawingOrderCallback);
}
 

public void drawVertical(Canvas c, RecyclerView parent) {
    final int childCount = parent.getChildCount();
    LuRecyclerViewAdapter adapter = (LuRecyclerViewAdapter) parent.getAdapter();
    for (int i = 0; i < childCount; i++) {
        if (adapter.isHeader(i) || adapter.isFooter(i)) {
            c.drawRect(0, 0, 0, 0, mPaint);
        } else {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getTop();
            final int bottom = child.getBottom() + verticalSpace;
            final int left = child.getRight() + params.rightMargin;
            final int right = left + horizontalSpace;
            c.drawRect(left, top, right, bottom, mPaint);
        }

    }
}
 

@Override
public boolean onItemLongClick(RecyclerView parent, View view, int position, long id) {

    int viewType = mWatchMeAdapter.getItemViewType(position);

    switch (viewType){
        case WatchMeAdapterNew.TYPE_HEADER_FIRST:
            getJobManager().addJob(new FetchAvailableVideoQualities("p3xpwfHm"));
            return true;

        case WatchMeAdapterNew.TYPE_VIDEO:
        case WatchMeAdapterNew.TYPE_VIDEO_LAST:

            mSelectedVideoPosition = position;

            PopupMenu popupMenu = new PopupMenu(view.getContext(), view, Gravity.TOP);
            popupMenu.setOnMenuItemClickListener(mOnMenuItemClickListener);
            popupMenu.inflate(R.menu.video_item_menu);
            popupMenu.show();
            return true;
    }

    return false;
}
 

@Override
public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {
    loadMoreDelegate.attach(recyclerView);
    final RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager == null) {
        Log.e(TAG, "Cannot setSpanSizeLookup on a null LayoutManager Object. " +
                "Call setLayoutManager with a non-null argument.");
        return;
    }

    if (layoutManager instanceof GridLayoutManager) {
        ((GridLayoutManager) layoutManager).setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                Object obj = getItems().get(position);
                return obj.getClass().equals(LoadMoreItem.class) ? ((GridLayoutManager) layoutManager).getSpanCount() : 1;
            }
        });
    }
}
 

public SmartRecycleView setLayoutManger(LayoutManagerType layoutManagerType, int orientation, int spanCout) {
    RecyclerView.LayoutManager layoutManager = null;
    if (layoutManagerType == LayoutManagerType.LINEAR_LAYOUT) {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext);
        linearLayoutManager.setOrientation(orientation);
        layoutManager = linearLayoutManager;
    } else if (layoutManagerType == LayoutManagerType.GRID_LAYOUT) {
        GridLayoutManager gridLayoutManager = new GridLayoutManager(mContext, spanCout);
        gridLayoutManager.setOrientation(orientation);
        layoutManager = gridLayoutManager;
    } else if (layoutManagerType == LayoutManagerType.STAGGER_LAYOUT) {
        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(spanCout, orientation);
        layoutManager = staggeredGridLayoutManager;
    }
    mRecyclerView.setLayoutManager(layoutManager);
    return this;
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    findViewById(R.id.btn_request).setOnClickListener(onClickListener);
    findViewById(R.id.btn_select_image).setOnClickListener(onClickListener);
    mTvResult = (TextView) findViewById(R.id.tv_result);
    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
            outRect.set(5, 5, 5, 5);
        }
    });
    mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));

    int size = measureSize();
    mAdapter = new AlbumPreviewAdapter(this, size);
    mRecyclerView.setAdapter(mAdapter);
}
 

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    switch (holder.getItemViewType())
    {
        case header:
            configureRecyclerHead((HeaderRecyclerViewHolder)holder);
            break;
        case general_list_item:
            configureGeneralItem((MyRoutesItemViewHolder)holder,position);
            break;
        default:
            configureGeneralItem((MyRoutesItemViewHolder)holder,position);
            break;
    }

}
 

/**
 * @return The final offset amount for children
 */
private int fixLayoutEndGapExpose(int endOffset, RecyclerView.Recycler recycler,
                                  RecyclerView.State state, boolean canOffsetChildren) {
    int gap = mOrientationHelper.getEndAfterPadding() - endOffset;
    int fixOffset = 0;
    if (gap > 0) {
        fixOffset = -scrollInternalBy(-gap, recycler, state);
    } else {
        return 0; // nothing to fix
    }
    // move offset according to scroll amount
    endOffset += fixOffset;
    if (canOffsetChildren) {
        // re-calculate gap, see if we could fix it
        gap = mOrientationHelper.getEndAfterPadding() - endOffset;
        if (gap > 0) {
            mOrientationHelper.offsetChildren(gap);
            return gap + fixOffset;
        }
    }
    return fixOffset;
}
 

private static Matcher<View> orderMatcher() {
    return new TypeSafeMatcher<View>() {
        @Override
        public void describeTo(Description description) {
            description.appendText("with correct position order");
        }

        @Override
        public boolean matchesSafely(View v) {
            RecyclerView view = (RecyclerView) v;
            if (view.getLayoutManager() == null) return false;
            ChildViewsIterable childViews = new ChildViewsIterable(view.getLayoutManager());
            int pos = view.getChildAdapterPosition(childViews.iterator().next());
            for (View child : childViews) {
                if (pos != view.getChildAdapterPosition(child)) {
                    return false;
                }
                pos ++;
            }
            return true;
        }
    };
}
 

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
    LayoutManager layoutManager = recyclerView.getLayoutManager();

    if (layoutManager instanceof GridLayoutManager) {
        GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
        final int spanCount = gridLayoutManager.getSpanCount();
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                // 如果当前是footer的位置，那么该item占据一行的个单元格，正常情况下占据1个单元格
                if (getItemViewType(position) == FOOTER_TYPE) {
                    return spanCount;
                } else if (isRefreshHeader(position) || getItemViewType(position) == getHeaderTypeByPosition(position - 1)) {
                    return spanCount;
                } else {
                    return 1;
                }
            }
        });
    }
    mAdapter.onAttachedToRecyclerView(recyclerView);
}
 

private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                               int heightSpec, int[] measuredDimension) {

    View view = recycler.getViewForPosition(position);

    // For adding Item Decor Insets to view
    super.measureChildWithMargins(view, 0, 0);
    RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
    int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
            getPaddingLeft() + getPaddingRight() + getDecoratedLeft(view) + getDecoratedRight(view), p.width);
    int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
            getPaddingTop() + getPaddingBottom() + getPaddingBottom() + getDecoratedBottom(view), p.height);
    view.measure(childWidthSpec, childHeightSpec);

    // Get decorated measurements
    measuredDimension[0] = getDecoratedMeasuredWidth(view) + p.leftMargin + p.rightMargin;
    measuredDimension[1] = getDecoratedMeasuredHeight(view) + p.bottomMargin + p.topMargin;
    recycler.recycleView(view);
}
 

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_list, container, false);
    fab = (ButtonFloat) view.findViewById(R.id.new_edit_fab);
    fab.setOnClickListener(this);

    recyclerView = (RecyclerView) view.findViewById(R.id.list_recyclerview);
    initRecyclerView();

    LogUtils.e("onCreateView");
    return view;
}
 

@Override
    protected void initFragment(Bundle savedInstanceState) {
        refreshLayout.setOnRefreshListener(this);
        refreshLayout.setColorSchemeColors(ViewUtils.getRefreshLayoutColors(getContext()));

        recyclerView.setLayoutManager(new CatchableLinearLayoutManager(getActivity()));
        adapter.setOnItemLongClickListener(this);
        adapter.setOnItemClickListener(this);
        recyclerView.setAdapter(adapter);

        layTip.setVisibility(View.GONE);

        //adapter 数据观察者，当数据为空时，显示空提示
        observer = new RecyclerView.AdapterDataObserver() {
            @Override
            public void onChanged() {
                super.onChanged();
                int itemCount = adapter.getItemCount();
                if (itemCount == 0) {
                    refreshLayout.setVisibility(View.GONE);
                    layTip.setVisibility(View.VISIBLE);
                    tvTip.setText(getEmptyTip());
                    errorImage.setVisibility(View.GONE);
                } else {
                    refreshLayout.setVisibility(View.VISIBLE);
                    layTip.setVisibility(View.GONE);
                    itemCount -= getHeaderSize();
                    if(loadMoreEnable && autoJudgeCanLoadMoreEnable){
                        canLoadMore = itemCount % getPagerSize() == 0 ;
//                        curPage = itemCount % getPagerSize() == 0 ?
//                                itemCount / getPagerSize() : (itemCount / getPagerSize()) + 1;
                    }
                }
            }
        };
        adapter.registerAdapterDataObserver(observer);
        recyclerView.setOnScrollListener(new ScrollListener());
        refreshLayout.setRefreshing(true);
        initScrollListener();
    }
 

@Override
public void onScrolled(RecyclerView view, int dx, int dy) {
    if (loadMoreListener != null) {
        int lastVisibleItemPosition = 0;
        int totalItemCount = mLayoutManager.getItemCount();

        if (mLayoutManager instanceof StaggeredGridLayoutManager) {
            int[] lastVisibleItemPositions = ((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null);
            lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions);
        } else if (mLayoutManager instanceof LinearLayoutManager) {
            lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
        } else if (mLayoutManager instanceof GridLayoutManager) {
            lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
        }

        if (totalItemCount < previousTotalItemCount) {
            this.currentPage = 0;
            this.previousTotalItemCount = totalItemCount;
            if (totalItemCount == 0) {
                this.loading = true;
            }
        }

        if (loading && (totalItemCount > previousTotalItemCount)) {
            loading = false;
            previousTotalItemCount = totalItemCount;
        }

        int visibleThreshold = 5;
        if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) {
            currentPage++;
            loadMoreListener.onLoadMore(loadMoreListener.getMessagesCount(), totalItemCount);
            loading = true;
        }
    }
}
 

private void initRecyclerView() {
    recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView_home_fragment);
    if (recyclerAdapter == null) {
        initRecyclerViewData(new ArrayList<Commodity>());
    }
    recyclerView.setAdapter(recyclerAdapter);
    recyclerView.setLayoutManager(
        new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    presenter.refreshRecyclerAdapterData(RefreshType.Refresh);
}
 

/**
 * Checks if a divider drawable has been defined in the current theme. If it has, will apply
 * an item decoration with the divider. If no divider has been specified, then does nothing.
 */
protected void configureItemDecoration(@NonNull LayoutInflater inflater,
                                       @NonNull RecyclerView recyclerView) {
    final TypedArray attributes =
            getActivity().obtainStyledAttributes(new int[]{R.attr.nnf_list_item_divider});
    Drawable divider = attributes.getDrawable(0);
    attributes.recycle();

    if (divider != null) {
        recyclerView.addItemDecoration(new DividerItemDecoration(divider));
    }
}
 

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_main_photo_edit_emoji, container, false);

    emojiRecyclerView = (RecyclerView) rootView.findViewById(R.id.fragment_main_photo_edit_emoji_rv);
    emojiRecyclerView.setHasFixedSize(true);
    emojiRecyclerView.setLayoutManager(new GridLayoutManager(photoEditorActivity, 4));
    EmojiAdapter adapter = new EmojiAdapter(photoEditorActivity, emojiIds);
    adapter.setOnEmojiClickListener(this);
    emojiRecyclerView.setAdapter(adapter);

    return rootView;
}
 

/**
 * Layout the item view witch position special by {@link GalleryLayoutManager#mInitialSelectedPosition} first and then layout the other
 *
 * @param recycler
 * @param state
 */
private void firstFillWithVertical(RecyclerView.Recycler recycler, RecyclerView.State state) {
    detachAndScrapAttachedViews(recycler);
    int topEdge = getOrientationHelper().getStartAfterPadding();
    int bottomEdge = getOrientationHelper().getEndAfterPadding();
    int startPosition = mInitialSelectedPosition;
    int scrapWidth, scrapHeight;
    Rect scrapRect = new Rect();
    int width = getHorizontalSpace();
    int leftOffset;
    //layout the init position view
    View scrap = recycler.getViewForPosition(mInitialSelectedPosition);
    addView(scrap, 0);
    measureChildWithMargins(scrap, 0, 0);
    scrapWidth = getDecoratedMeasuredWidth(scrap);
    scrapHeight = getDecoratedMeasuredHeight(scrap);
    leftOffset = (int) (getPaddingLeft() + (width - scrapWidth) / 2.0f);
    int top = (int) (getPaddingTop() + (getVerticalSpace() - scrapHeight) / 2.f);
    scrapRect.set(leftOffset, top, leftOffset + scrapWidth, top + scrapHeight);
    layoutDecorated(scrap, scrapRect.left, scrapRect.top, scrapRect.right, scrapRect.bottom);
    if (getState().mItemsFrames.get(startPosition) == null) {
        getState().mItemsFrames.put(startPosition, scrapRect);
    } else {
        getState().mItemsFrames.get(startPosition).set(scrapRect);
    }
    mFirstVisiblePosition = mLastVisiblePos = startPosition;
    int topStartOffset = getDecoratedTop(scrap);
    int bottomStartOffset = getDecoratedBottom(scrap);
    //fill left of center
    fillTop(recycler, mInitialSelectedPosition - 1, topStartOffset, topEdge);
    //fill right of center
    fillBottom(recycler, mInitialSelectedPosition + 1, bottomStartOffset, bottomEdge);
}
 

public InsertThreadIntoDatabaseTask(Activity activity, InfiniteDbHelper infiniteDbHelper, String boardName, String resto, int threadPosition, boolean firstRequest, RecyclerView recyclerView, ThreadAdapter threadAdapter) {
    onAttach(activity);
    this.infiniteDbHelper = infiniteDbHelper;
    this.boardName = boardName;
    this.resto = resto;
    this.threadAdapter = threadAdapter;
    this.recyclerView = recyclerView;
    this.threadPosition = threadPosition;
    this.firstRequest = firstRequest;
}
 

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    TabLayout tabLayout = this.mTabLayoutRef.get();
    final RecyclerViewPager viewPager = (RecyclerViewPager) recyclerView;
    final int pagerWidth = recyclerView.getWidth()
            - recyclerView.getPaddingLeft()
            - recyclerView.getPaddingRight();
    final View centerXChild = ViewUtils.getCenterXChild(viewPager);
    if (centerXChild == null) {
        return;
    }
    int centerChildPosition = viewPager.getChildAdapterPosition(centerXChild);
    float offset = mPagerLeftBeforeScroll - centerXChild.getLeft()
            + pagerWidth * (centerChildPosition - mPositionBeforeScroll);
    final float positionOffset = offset * 1f / pagerWidth;
    if (tabLayout != null) {
        if (positionOffset < 0) {
            try {
                tabLayout.setScrollPosition(mPositionBeforeScroll
                        + (int) Math.floor(positionOffset),
                    positionOffset - (int) Math.floor(positionOffset),
                    false);
            } catch (Throwable e) {
                e.printStackTrace();
            }
        } else {
            tabLayout.setScrollPosition(mPositionBeforeScroll + (int) (positionOffset),
                    positionOffset - (int) (positionOffset),
                    false);
        }
    }
    Log.d("test", "dx:" + positionOffset);
}
 

@Override
public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
    if (mOrientation == VERTICAL) {
        outRect.set(0, 0, 0, 1);
    } else {
        outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
    }
}
 

@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
    View childView = view.findChildViewUnder(e.getX(), e.getY());
    if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
        mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
    }
    return false;
}
 

@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
    super.onDraw(c, parent, state);
    int count = parent.getChildCount();
    int left = parent.getPaddingLeft();
    int right = parent.getWidth() - parent.getPaddingRight();
    for (int i = 0; i < count - 1; i++) {
        View view = parent.getChildAt(i);
        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
        int top = view.getBottom() + params.bottomMargin;
        int bottom = top + mDrawable.getIntrinsicHeight();
        mDrawable.setBounds(left, top, right, bottom);
        mDrawable.draw(c);
    }
}
 

@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
    if (actionState == 2) { // Drag start
        dragging = true;
        draggedElementPos = viewHolder.getLayoutPosition();
        elementMoved = false;
    } else if (actionState == 1) {
        swiping = true;
        swipedElementPos = viewHolder.getLayoutPosition();
    } else if (actionState == 0) { // Drop
        if (dragging) {
            dragging = false;
            if (!elementMoved && triggerOnDrop) {
                //VH vh = (VH) recyclerView.findViewHolderForAdapterPosition(draggedElementPos);
                //triggerSelectionMode(vh, draggedElementPos);
                VH vh;
                for (VH v: viewHolders) {
                    if (v.getAdapterPosition() == draggedElementPos) {
                        vh = v;
                        triggerSelectionMode(vh, draggedElementPos);
                        break;
                    }
                }
            }
        } else if (swiping) {
            swiping = false;
        }

    }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_reminders);
    setTheme(R.style.AppThemeToolBarLite); // for toolbar mode

    //setSupportActionBar((Toolbar)findViewById(R.id.reminder_toolbar));
    JoH.fixActionBar(this);

    setTitle(getString(R.string.xdrip_reminders));
    // TODO subtitle with summary
    recyclerView = (RecyclerView) findViewById(R.id.reminder_recycler);
    floatingsnooze = (CardView) findViewById(R.id.floatingsnooze);
    floaterText = (TextView) findViewById(R.id.floaterText);

    floatingsnooze.setVisibility(View.GONE);

    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);

    mAdapter = new RecyclerAdapter(this, reminders);

    if (selectedSound == null) {
        if (PersistentStore.getString("reminders-last-sound").length() > 5)
            selectedSound = PersistentStore.getString("reminders-last-sound");
    }

    reloadList();

    postOnCreate();

    final Bundle bundle = getIntent().getExtras();
    processIncomingBundle(bundle);


    if (reminders.size() == 0) {
        //JoH.static_toast_long("No reminders yet, add one!"); // replace with showcase?
        showcase(this, Home.SHOWCASE_REMINDER1);
    }
}
 

public void drawHorizontal(Canvas c, RecyclerView parent) {
    final int top = parent.getPaddingTop() + topMargin;
    final int bottom = parent.getHeight() - parent.getPaddingBottom() - bottomMargin;

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                .getLayoutParams();
        final int left = child.getRight() + params.rightMargin + leftMargin;
        final int right = left + width;
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}
 

/**
 * Right recyclerView linkage left tabLayout
 * SCROLL_STATE_IDLE just call once
 *
 * @param newState RecyclerView new scroll state
 */
private void rightLinkageLeft(int newState) {
    if (newState == RecyclerView.SCROLL_STATE_IDLE) {
        if (isClickTab) {
            isClickTab = false;
            return;
        }
        int firstPosition = mManager.findFirstVisibleItemPosition();
        if (index != firstPosition) {
            index = firstPosition;
            setChecked(index);
        }
    }
}
 

private void init() {
    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    setTitle(R.string.app_name);
    mToolbar.setTitleTextColor(Color.WHITE);

    mFabButton = (ImageButton) findViewById(R.id.fab);
    mFabButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getApplicationContext(), "FAB", Toast.LENGTH_SHORT).show();
        }
    });

    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
    recyclerView.setAdapter(recyclerAdapter);
    recyclerView.setOnScrollListener(new HidingScrollListener() {
        @Override
        public void onHide() {
            hideViews();
        }

        @Override
        public void onShow() {
            showViews();
        }
    });

}
 

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_seven);
    mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    mRecyclerView2 = (RecyclerView) findViewById(R.id.recyclerView2);
    mRecyclerView3 = (RecyclerView) findViewById(R.id.recyclerView3);
    mRecyclerView4 = (RecyclerView) findViewById(R.id.recyclerView4);
    initRecyclerView();
    initRecyclerView2();
    initRecyclerView3();
    initRecyclerView4();
}